Give reasons.
a.Neon is an inert gas.
b.The valency of oxygen is two.
c.The elements of group IA are called alkali metals.
d.Chlorine is a very reactive non-metals.
e.Naturally, an atom is neutral in charge.
f.The nucleus of an atom is positively charged.
g.Modern periodic table is better than Mendeleev's periodic table
h.Elements of the same group have the same chemical properties.
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1. because it completes its octet .
2. because it has only 6 electrons in outermost shell .it needs 2 electrons to complete its octet.so its valency is 2 but negative because it need 2 more electrons.
f. because in nucleus protons and neutrons are present and as we know that neutrons have no charge and protons are positively charged . so the charge of nucleus is positive due to protons.
g. modern periodic table was given by mosley and it is better than mendleeves periodic table because it has a space for the elements that will be discovered in future..
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